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Effect of Side Groove Geometry on Crack Propagation Behavior and K1SSC in DCB Test

Picture for Effect of Side Groove Geometry on Crack Propagation Behavior and K1SSC in DCB Test
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Product Number: 51321-16341-SG
Author: Yuji Arai/Jun Nakamura/Hiroki Kamitani/Keiichi Kondo/Hisashi Amaya/Taishi Fujishiro
Publication Date: 2021
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The double-cantilever beam (DCB) test method standardized in NACE TM0177-2016 is being increasingly applied as a quality assurance test to specify the performance of carbon and low-alloy steels for the sour service. The DCB test can contribute to the quantitative evaluation of the fracture toughness in a specific environment by assessing the crack arrest of a pre-cracked specimen. The test method has been discussed from the viewpoint of specimen geometries, such as side-groove root configurations, which are considered to change the stress concentration and thereby prevent the edge crack occurrence. In this paper, the DCB test was conducted with the current standard V-type and a proposed U-type side-groove configuration in order to compare crack propagation behaviors, by using in-situ ultrasonic observations and K1SSC values with 110 ksi sour grade material in a simulated sour environment. Crack propagation began a few hours after initiation of the test in NACE Solution A saturated with 1 bar H2S gas. The crack propagation rate and the final crack length were similar between the DCB specimens with the V-type and U-type side grooves. The obtained K1SSC values were almost the same, regardless of the side-groove configuration. In addition, the frequency of edge cracks for DCB specimens with theU-type side groove was lower than that of those with the V-type side groove. Therefore, it is appropriate to use the proposed U-type side-groove configuration for the DCB test.

Key words: Double Cantilever Beam, Sulfide stress cracking, FEA, K1SSC, NACE TM0177-2016 Method D, Compliance, Crack start position. 

The double-cantilever beam (DCB) test method standardized in NACE TM0177-2016 is being increasingly applied as a quality assurance test to specify the performance of carbon and low-alloy steels for the sour service. The DCB test can contribute to the quantitative evaluation of the fracture toughness in a specific environment by assessing the crack arrest of a pre-cracked specimen. The test method has been discussed from the viewpoint of specimen geometries, such as side-groove root configurations, which are considered to change the stress concentration and thereby prevent the edge crack occurrence. In this paper, the DCB test was conducted with the current standard V-type and a proposed U-type side-groove configuration in order to compare crack propagation behaviors, by using in-situ ultrasonic observations and K1SSC values with 110 ksi sour grade material in a simulated sour environment. Crack propagation began a few hours after initiation of the test in NACE Solution A saturated with 1 bar H2S gas. The crack propagation rate and the final crack length were similar between the DCB specimens with the V-type and U-type side grooves. The obtained K1SSC values were almost the same, regardless of the side-groove configuration. In addition, the frequency of edge cracks for DCB specimens with theU-type side groove was lower than that of those with the V-type side groove. Therefore, it is appropriate to use the proposed U-type side-groove configuration for the DCB test.

Key words: Double Cantilever Beam, Sulfide stress cracking, FEA, K1SSC, NACE TM0177-2016 Method D, Compliance, Crack start position. 

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The Double Cantilever Beam (DCB) test method standardized in ANSI NACE TM0177 is increasingly applied as a quality assurance test to specify the performance of carbon and low alloy steels for sour service. The DCB test method has been modified and specified tightly from the view point of specimen geometry test environment and initial stress intensity factor controlled by arm displacement to obtain highly repeatable test results.NACE TM0177 2016 method D has various types of starter notch configurations on DCB specimens. Crack start position shifted change specimen of EDM notch has been in accordance with NACE TM0177 since 2016 and the distance from a pin hole to a crack starter has been different.Previous research the influence of crack starter position on K1SSC has been revealed using Finite Element Analysis (FEA) and DCB tests. In this paper in order to clarify the applicability of compliance curve in TM0177-2016 and propose the new compliance curves FEA and experimental approach was performed. K1SSC of DCB tests should be evaluated in the same crack start positions from the view point of a fracture mechanics.
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